Compare lines 586-87 with those spoken by satan in book i: "the mind is its own place, and in itself can make a heav'n of hell, a hell of heav'n."
from paradise lost

In the given lines, Satan implies that how you think shapes the kind of place you want to be. You can make heaven out of hell if you think of it. You can also make hell out of heaven if you desire it. Satan plays on the desire of human beings and that is why he reveals the true nature of our minds.